Citrix Provisioning – vDisk RAM cache size not able to set more than 4GB/8GB

I had an issue when trying to assign vDisk RAM cache for 10GB, In the target device RAM cache was showing only 8GB. I know it’s a limitation in Windows 2003 STD where the OS limitation is 4GB, however i had Windows 2003 enterprise edition.

Did some check and found there’s a regkey to be tweaked to set the value for more than 8GB.